package com.example.forum.services.impl;

import com.example.forum.common.AppResult;
import com.example.forum.common.ResultCode;
import com.example.forum.dao.UserMapper;
import com.example.forum.exception.ApplicationException;
import com.example.forum.model.User;
import com.example.forum.services.IUserService;
import com.example.forum.utils.MD5Util;
import com.example.forum.utils.StringUtil;
import com.example.forum.utils.UUIDUtil;
import jakarta.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.Date;

@Slf4j
@Service
public class UserServiceImpl implements IUserService {
    @Resource
    private UserMapper userMapper;
    //非空校验
    @Override
    public void createNormalUser(User user) {
        if (user == null || StringUtil.isEmpty(user.getUsername()) ||
                StringUtil.isEmpty(user.getNickname()) || StringUtil.isEmpty(user.getPassword())) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //按用户名查询用户信息
        User existsUser = userMapper.selectByUserName(user.getUsername());
        //判断用户是否存在
        if (existsUser != null){
            log.info(ResultCode.FAILED_USER_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_EXISTS));
        }
        //设置默认值(新用户)
        user.setGender((byte)2);
        user.setArticleCount(0);
        user.setIsAdmin((byte)0);
        user.setState((byte)0);
        user.setDeleteState((byte)0);
        // 当前日期
        Date date = new Date();
        user.setCreateTime(date);
        user.setUpdateTime(date);

        //写进数据库
        int row = userMapper.insertSelective(user);
        if (row != 1){
            log.info(ResultCode.FAILED_CREATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        log.info("添加新用户成功 username = "+user.getUsername());
        }

    @Override
    public User selectByUserName(String username) {
        //非空校验
        if (StringUtil.isEmpty(username)){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //返回查询结果
        return userMapper.selectByUserName(username);
    }

    @Override
    public User login(String username, String password) {
        //非空校验
        if (StringUtil.isEmpty(username) || StringUtil.isEmpty(password)){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //按用户名查询用户信息
        User user = selectByUserName(username);
        //查询结果是否非空
        if (user == null){

                log.warn(ResultCode.FAILED_LOGIN.toString() + ",密码错误 username = "+username);
                throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));

        }
        //校验密码
        String encryptPassword = MD5Util.md5Salt(password,user.getSalt());
        if (!encryptPassword.equalsIgnoreCase(user.getPassword())){
            log.warn(ResultCode.FAILED_LOGIN.toString() + ",username = "+username);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //登录成功返回用户信息
        log.info("登录成功,username = "+username);
        return user;
    }

    @Override
    public User selectById(Long id) {
        //非空校验
        if (id == null){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //调用DAO查询数据库获取对象
        User user = userMapper.selectByPrimaryKey(id);
        return user;
    }

    @Override
    public void addOneArticleCountById(Long id) {

        if (id == null || id <= 0){
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        //查询用户信息
        User user = userMapper.selectByPrimaryKey(id);
        if (user == null){
            log.warn(ResultCode.ERROR_IS_NULL.toString()+",board id = "+id);
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //更新用户的发帖数量
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setArticleCount(user.getArticleCount() +1);
        //更新数据库
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row != 1){
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
    }

    @Override
    public void subOneArticleCountById(Long id) {
        if (id == null || id <= 0){
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        //查询用户信息
        User user = userMapper.selectByPrimaryKey(id);
        if (user == null){
            log.warn(ResultCode.ERROR_IS_NULL.toString()+",board id = "+id);
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //更新用户的发帖数量
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setArticleCount(user.getArticleCount() -1);
        if (updateUser.getArticleCount() < 0){
            updateUser.setArticleCount(0);
        }
        //更新数据库
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row != 1){
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
    }

    @Override
    public void modifyInfo(User user) {
        if (user == null || user.getId() <= 0 || user.getId() == null) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //校验用户是否存在
        User existsUser = userMapper.selectByPrimaryKey(user.getId());
        if (existsUser == null ) {
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //定义标志位
        boolean checkAttr = false;
        //定义更新的对象
        User updateUser = new User();
        //设置用户Id
        updateUser.setId(user.getId());
        //对参数进行校验、赋值
        if (!StringUtil.isEmpty(user.getUsername()) && !user.getUsername().equals(existsUser.getUsername())){
            //对用户名进行唯一性校验
            User checkUser = userMapper.selectByUserName(user.getUsername());
            if (checkUser != null){
                log.warn(ResultCode.FAILED_USER_EXISTS.toString());
                throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_EXISTS));
            }
            updateUser.setUsername(user.getUsername());
            checkAttr = true;
        }

        //校验昵称
        if (!StringUtil.isEmpty(user.getNickname())
                && !user.getNickname().equals(existsUser.getNickname())) {
            // 设置昵称
            updateUser.setNickname(user.getNickname());
            // 更新标志位
            checkAttr = true;
        }
        //校验性别
        if (user.getGender() != null && user.getGender() !=
                existsUser.getGender()) {
            // 设置性别
            updateUser.setGender(user.getGender());
            // 合法性校验
            if (updateUser.getGender() > 2 || updateUser.getGender() < 0) {
                updateUser.setGender((byte) 2);
            }
            // 更新标志位
            checkAttr = true;
        }
        //校验邮箱
        if (!StringUtil.isEmpty(user.getEmail())
                && !user.getEmail().equals(existsUser.getEmail())) {
            // 设置邮箱
            updateUser.setEmail(user.getEmail());
            // 更新标志位
            checkAttr = true;
        }
        //校验电话号码
        if (!StringUtil.isEmpty(user.getPhoneNum())
                && !user.getPhoneNum().equals(existsUser.getPhoneNum())) {
            // 设置电话号码
            updateUser.setPhoneNum(user.getPhoneNum());
            // 更新标志位
            checkAttr = true;
        }
        //校验个⼈简介
        if (!StringUtil.isEmpty(user.getRemark())
                && !user.getRemark().equals(existsUser.getRemark())) {
            // 设置电话号码
            updateUser.setRemark(user.getRemark());
            // 更新标志位
            checkAttr = true;
        }
           //  根据标志位来决定是否可以执⾏更新
        if (checkAttr == false) {
            // 打印⽇志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new
                    ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //调⽤DAO
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row != 1) {
            log.warn(ResultCode.FAILED.toString() + ", 受影响的⾏数不等于 1 .");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void modifyPassword(Long id, String newPassword, String oldPassword) {
        if (id == null || id <= 0 || StringUtil.isEmpty(newPassword) || StringUtil.isEmpty(oldPassword)){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //查询用户信息
        User user = userMapper.selectByPrimaryKey(id);
        if (user == null || user.getDeleteState() == 1){
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //校验老密码是否正确
        String oldEncryptPassword = MD5Util.md5Salt(oldPassword,user.getSalt());
        if (!oldEncryptPassword.equals(user.getPassword())){
            log.warn(ResultCode.FAILED.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
        //生成一个新的盐
        String salt = UUIDUtil.UUID_32();
        //生成新密码
        String encryptPassword = MD5Util.md5Salt(newPassword,salt);
        //更新
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setSalt(salt);
        updateUser.setPassword(encryptPassword);
        updateUser.setUpdateTime(new Date());
        //调用DAO
        int row = userMapper.updateByPrimaryKeySelective(updateUser);
        if (row != 1) {
            log.warn(ResultCode.FAILED.toString() + ", 受影响的⾏数不等于 1 .");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }
}



























